Riba South Sustainability Through Envelope Efficiency


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Riba South Sustainability Through Envelope Efficiency

  1. 1. Matt Robinson Natural Building Technologies
  2. 2. Natural Building Technologies <ul><li>Environmental building systems. </li></ul><ul><li>Full technical support in sales, design, specification and on-site </li></ul><ul><li>Our systems are proven on the continent over many years and tens of thousands of buildings on the continent and now UK. </li></ul><ul><li>Cost effective when compared to ‘traditional’ UK systems. </li></ul>
  3. 3. The Issue: Buildings <ul><li>Use too much: </li></ul><ul><ul><li>Energy </li></ul></ul><ul><ul><li>Resources </li></ul></ul><ul><li>Generate too much: </li></ul><ul><ul><li>Waste </li></ul></ul><ul><ul><li>C0 2 </li></ul></ul><ul><li>Are Unhealthy </li></ul>
  4. 4. The Issue – UK energy use
  5. 5. The Agenda: Energy in Buildings
  6. 6. The route: Policy <ul><li>2006, 2010, 2016 building regs – Part L </li></ul><ul><li>Code for Sustainable Homes </li></ul><ul><li>Low Carbon Building Programme </li></ul><ul><li>Green Taxes? </li></ul>
  7. 7. Issues: Is Zero truly 0 ? <ul><li>What if we use a lot of energy and resources, and create a lot of pollution to do ‘Zero’? </li></ul><ul><li>What if ‘Zero’ doesn’t exist? </li></ul><ul><li>Is there a ‘sweet spot’ just below ‘Zero’? </li></ul>
  8. 8. Issues: Inertia and Resistance <ul><ul><li>Lack of Knowledge and mis-information </li></ul></ul><ul><ul><li>Very poor standards of construction </li></ul></ul><ul><ul><li>Centered around multiple trades, not buildings </li></ul></ul><ul><ul><li>Liability contracts vs responsibility contracts </li></ul></ul><ul><ul><li>Capital cost reduction </li></ul></ul>
  9. 9. Issues: Inertia and Resistance <ul><li>Really Sustainable? </li></ul><ul><ul><li>Greenwash </li></ul></ul><ul><ul><li>Theory vs Reality </li></ul></ul><ul><ul><li>Offsetting is wrong </li></ul></ul><ul><li>Who checks the claims? </li></ul>
  10. 10. Issues: A tale of two halls Sheffield Town Hall - 1897 ‘ D’ Rating, 218kwh/m2/yr London City Hall - 2003 ‘ E’ Rating, 267kwh/m2/yr +30% CO 2/ kwh/m2/yr
  11. 11. Current Situation <ul><li>Stamford Brook: </li></ul><ul><li>710no, cavity wall masonry dwellings </li></ul><ul><li>Monitoring of design and construction issues by Leeds Met. University. </li></ul><ul><li>CO 2 Was 10%ish better than 2006 standards </li></ul><ul><li>Many other sustainable features (recycling, wildlife, transport etc) </li></ul><ul><li>http://www.leedsmet.ac.uk/as/cebe/projects/stamford/ </li></ul>
  12. 12. Current Situation <ul><li>Stamford Brook: </li></ul><ul><li>710 cavity wall masonry dwellings </li></ul><ul><li>Monitoring of design and construction issues by Leeds Met. University. </li></ul><ul><li>CO 2 Was 10%ish better than 2006 standards </li></ul><ul><li>Many other sustainable features (recycling, wildlife, transport etc) </li></ul><ul><li>http://www.leedsmet.ac.uk/as/cebe/projects/stamford/ </li></ul>42% missed the 5ach target for infiltration Heat loss co-efficient 75-105% worse than predicted
  13. 13. Stamford Brook Findings: Infiltration Lights, loft hatches, wall/floor and wall/roof junctions, partition walls Patio door – unsealed threshold Rooflights leaked around frames, seals and trickle vents Service penetrations particular problem
  14. 14. Stamford Brook Findings: Heat loss <ul><ul><li>Y-values </li></ul></ul><ul><ul><ul><li>Poor design AND </li></ul></ul></ul><ul><ul><ul><li>Not built ‘as designed’ </li></ul></ul></ul><ul><ul><li>Party wall heat losses </li></ul></ul>
  15. 15. Stamford Brook Findings Nominal vs. Realised Heating System Efficiencies Nominal vs. Realised Thermal Bridging Y-values Nominal vs. Realised Fabric U-values ‘ Build-ability’ problems and lack of knowledge Occupant effects – e.g. Removing CFL’s
  16. 16. UK Construction Standards: Some Shocking Facts <ul><ul><li>50% of new builds miss ‘as designed’ energy use by up-to 50%. </li></ul></ul><ul><ul><li>30% of new builds fail infiltration standard of 10ach@5pa </li></ul></ul><ul><li>Energy Saving Trust (2004) </li></ul><ul><li>Room in roof U-values on average 104% worse than ‘as calculated’ </li></ul><ul><ul><li>Average full-fill cavity wall was 20% worse than ‘as calculated’ </li></ul></ul><ul><li>Dept. Environment Travel Regions (DETR) (2001 report) </li></ul><ul><li>Energy use in residential buildings has increased by 20% since 1970 </li></ul><ul><li>Building Research Establishment (BRE 2003+2007) </li></ul>
  17. 17. If I was to go there, would I start here? UK Construction industry 2008 UK Construction industry 2016
  18. 18. Solutions? <ul><li>Eco-clichés get in the way of good, efficient and truly environmental solutions. </li></ul><ul><li>Howard Liddell </li></ul>
  19. 19. Solutions ?
  20. 20. Solutions: Technology Problems <ul><li>Overstatement of performance </li></ul><ul><li>Inappropriate site’s </li></ul><ul><li>Maintenance costs </li></ul><ul><li>Embodied energy </li></ul><ul><li>ROI, Payback </li></ul><ul><li>Disposal / recycling </li></ul><ul><li>Capital expenditure choices </li></ul><ul><li>UK cost </li></ul><ul><li>Excuse for envelope </li></ul>
  21. 21. Solutions
  22. 22. There is Another Way! We have the solutions We have the knowledge We have the research We have the built case-studies Its been done before (Look over the North Sea and oop North at our neighbours...)
  23. 23. The Solution <ul><li>“ Construction is about creating thermal efficiency, not mini power stations.” </li></ul>Imtiaz Farookhi Chief Executive NHBC
  24. 24. Eco or Sustainable or.... <ul><li>Passive Haus </li></ul><ul><ul><li>‘ Ultra low energy building standard.’ </li></ul></ul><ul><li>R2000 </li></ul><ul><ul><li>‘ ...based on an energy consumption target.’ </li></ul></ul><ul><li>Minergie </li></ul><ul><ul><li>‘ ...quality label for new and refurbished low-energy-consumption buildings.’ </li></ul></ul><ul><li>UK 2006 L2 </li></ul><ul><ul><li>‘ Conservation of fuel and power...’ </li></ul></ul>
  25. 25. Solutions!
  26. 26. Where are the savings? <ul><li>Clear that space heating and DHW are the key areas </li></ul><ul><li>Lights, appliances and cooking are 'simple' </li></ul>
  27. 27. We have the solution no.1 <ul><li>Thermal coherence of the building shell </li></ul><ul><ul><li>Good (low) U Values </li></ul></ul><ul><ul><li>Good (low) Y Values </li></ul></ul><ul><ul><li>Low Infiltration rates </li></ul></ul><ul><ul><li>Thermal response </li></ul></ul><ul><ul><li>Decrement Delay </li></ul></ul>
  28. 28. We have the solution no.2 <ul><li>Passive features </li></ul><ul><ul><li>Building form </li></ul></ul><ul><ul><li>Orientation </li></ul></ul><ul><ul><ul><li>Passive solar (heat) gain </li></ul></ul></ul><ul><ul><ul><li>Passive solar (light) gain </li></ul></ul></ul><ul><ul><ul><li>Manage glazing heat loss </li></ul></ul></ul><ul><ul><li>Shading (planting or built </li></ul></ul><ul><ul><li>Shelter belts </li></ul></ul>Images: Greenspec
  29. 29. We have the solution no.3 <ul><li>Increase in air-tightness means: </li></ul><ul><li>Air Quality </li></ul><ul><ul><li>Avoid toxic or off-gassing materials </li></ul></ul><ul><li>Ventilation </li></ul><ul><ul><li>10-3ach = Passive ventilation? </li></ul></ul><ul><ul><li>3ach or better = MVHR? </li></ul></ul>
  30. 30. We have the solution no.4 <ul><li>Moisture management </li></ul><ul><li>Active </li></ul><ul><ul><li>effective ventilation (MVHR or passive) </li></ul></ul><ul><li>Passive </li></ul><ul><ul><li>True ‘Breathing wall’ systems </li></ul></ul>
  31. 31. We have the solution no.5 <ul><li>Appliances </li></ul><ul><ul><li>A-rated </li></ul></ul><ul><ul><li>Low energy lights </li></ul></ul><ul><li>Hot water </li></ul><ul><ul><li>Reduce demand </li></ul></ul><ul><ul><li>Reduce dead legs and pipe runs </li></ul></ul><ul><ul><li>Heat efficiently </li></ul></ul>
  32. 32. We have the solution no.6 <ul><li>Lower heating and cooling loads and peak demands </li></ul><ul><li>= </li></ul><ul><li>use renewables effectively </li></ul>
  33. 33. Summary of ‘The Solution’ <ul><li>Efficiency / passive is 80% of the battle </li></ul><ul><li>Renewables / active /technology are last 20% </li></ul><ul><li>Think about managing moisture & removing toxins </li></ul>
  34. 34. If you could focus on one thing.... <ul><li>“ Thermal bridging was shown as the worst area of non-compliance. Other significant non-compliance areas included conservatories, u-values , areas of windows , doors and rooflights , internal lighting , commissioning certificates , O&M manuals and air-leakage” </li></ul><ul><li>The Energy Efficiency Partnership for Homes (Future Energy Solutions) </li></ul><ul><li>Building Regulations Compliance (BRE ) </li></ul>
  35. 35. The Effect of y-values
  36. 36. The importance of detailing: ThermoPlan <ul><li>Window on ‘outside’ = psi of 0.159w/m2/k </li></ul><ul><li>Window ‘setback’ = psi of 0.099w/m2/k </li></ul>
  37. 37. Low Ψ values <ul><li>Un-accredited + 0.15w/m 2 /k </li></ul><ul><li>Accredited + 0.08w/m 2 /k </li></ul><ul><li>ThermoPlan +0.04w/m 2 /k </li></ul><ul><li>Pavaclad +0.04w/m 2 /k </li></ul><ul><li>Diffutherm + 0.02w/m 2 /k </li></ul>
  38. 38. UK Construction: The Solution <ul><ul><li>Use systems that have proven track record in low energy buildings. </li></ul></ul><ul><ul><li>Use systems that with low Ψ / Y values and low U-values. </li></ul></ul><ul><ul><li>Ensure that U, Ψ and Y values are built ‘as designed’ </li></ul></ul><ul><ul><li>Use construction systems that have an airtight strategy and a contractor responsible for airtightness. </li></ul></ul>
  39. 39. Build it efficiently Article: Joseph Little, Deantus Projects Ltd in Construct Ireland Is this the real challenge?
  40. 40. Change:- Its not (just) Architects... <ul><li>Supply chain delivery </li></ul><ul><li>Certification processes </li></ul><ul><li>Training in ALL parts of the industry </li></ul><ul><li>New design and aesthetics (*waves bye to bricks*) </li></ul><ul><li>Site organisation – shell building </li></ul><ul><li>From liability to responsibility </li></ul><ul><li>Financial and insurance drivers </li></ul><ul><li>Home owner education </li></ul>
  41. 41. Holistic Solutions <ul><li>Energy </li></ul><ul><li>Carbon </li></ul><ul><li>Resources </li></ul><ul><li>Building Fabric </li></ul><ul><li>Human Health </li></ul><ul><li>Deliverability </li></ul><ul><li>Durability </li></ul>
  42. 42. Its a Team Effort <ul><li>Client </li></ul><ul><li>Architects </li></ul><ul><li>Planners </li></ul><ul><li>M&E </li></ul><ul><li>Structural </li></ul><ul><li>Building Control </li></ul><ul><li>Contractor </li></ul><ul><li>Subbie </li></ul>They need to understand all this (and more)
  43. 43. Summary <ul><li>Set clear targets </li></ul><ul><li>Efficiency, Efficiency, Efficiency </li></ul><ul><li>Good passive design and detailing </li></ul><ul><li>The building envelope comes first </li></ul><ul><li>Airtightness and Insulation </li></ul><ul><li>Ventilation </li></ul><ul><li>Simple vs Technology </li></ul><ul><li>Get a good team </li></ul><ul><li>Its not easy </li></ul>
  44. 44. Matt Robinson Natural Building Technologies